Will not power on
There is no power to the TV what so ever will not even turn on no lights no nothing
Either the fuse on the power supply is blown, or the power supply died.
They are not hard to replace, just a phillips screwdriver, and take the back off
and replace the board the ac power plugs into.
Before opening the tv unplug it and let it sit at least 30 minutes, before removing the back cover,
this lets the residual power drain off.